1. Major powers clashed on the sidelines of the Syrian war, as Turkey shot down a Russian warplane along Turkey’s border with Syria. The aftermath reverberated with Cold War tensions, highlighting the perils NATO countries and Russia face as they conduct uncoordinated operations against various factions, including the Islamic State, in Syria’s war.

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Pool photo by Maxim Shipenkov

2. France’s presidentmet with President Obama, seeking solidarity for a sharp increase in operations against the Islamic State less than two weeks after its terrorists killed 130 people in Paris. François Hollande travels next to Russia, to try to enlist the aid of Vladimir Putin, above, as well. But Russia’s backing of Syria’s president, Bashar al-Assad, presents an obstacle to cooperation with much of the West.

4. In Chicago, officials on Tuesday released a chilling dashcam video of the killing of a black 17-year-old who was shot 16 times last year. A white police officer turned himself in to answer charges of murder. The charges could blunt reaction to the court-ordered release of the video.

5. And in Minneapolis, two men — one white and one Hispanic — were arrested in a shooting late Monday that injured five people at a Black Lives Matter protest over a different police killing. A protest organizer described the shooting, saying masked men who had been “acting shady” opened fire after being escorted away from the demonstration.

6. For the 100th anniversary of Einstein’s general theory of relativity, our science writer offered this summation: “As compact and mysterious as a Viking rune, it describes space-time as a kind of sagging mattress where matter and energy, like a heavy sleeper, distort the geometry of the cosmos to produce the effect we call gravity, obliging light beams as well as marbles and falling apples to follow curved paths through space.”

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Charlie Neibergall/Associated Press

7. Ted Cruz is surging in Iowa. A new poll shows the Republican presidential candidate just behind Donald Trump and well ahead of Ben Carson, apparently thanks to his criticism of President Obama’s strategy against the Islamic State and rejection of Syrian refugees.

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Mike Brown/Space Florida, via Reuters

8. Jeff Bezos had some good news, too. “We’re walking on cloud 9,” the Amazon founder said, after his space company sent a rocket to the edge of space and watched it return and settle back perfectly on its launchpad. “There wasn’t a dry eye in the house,” he said.

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Danial Shah for The New York Times

9. This is not your usual story out of Pakistan. After the proprietor of a beloved bookstore in Islamabad died, people kept stepping forward to try to pay his son for books they had stolen when they were young. But the son, above left, said his father considered the thefts an investment in a reading public — and he is keeping the bookstore going strong.

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Seth Wenig/Associated Press

10. If you’re traveling for the Thanksgiving holiday, expect to see extra security, thanks to the State Department’s worldwide travel alert for Americans. But bookings — and prices — haven’t dropped, the founder of a travel website said. “I think people are refusing to be terrorized,” he said. “There have been no panic or fire sales.”

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Video

26.2 Frozen Miles

Highlights from the annual Antarctic Ice Marathon. Paul Webb of Britain was first among men, and Silvana Camelio of Chile won the women’s race.

11. Lastly, here’s a little something for armchair travelers — and armchair athletes. Over 50 competitors from 19 countries ran the Ice Marathon in the Antarctic this week, in temperatures that dipped below 0 degrees Fahrenheit. Most runners just bundled up, but John Fang, from Taiwan, dressed as a dragon. A British researcher, Paul Webb, won in 3:35.25. “Good to finish, freezing cold, freezing but it’s excellent,” he said.